SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 20: Poster: Spins and Magnetism at Surfaces
O 20.4: Poster
Montag, 27. März 2023, 18:00–20:00, P2/EG
Magnetic phase diagram of a YSR-molecule — •Benjamin A. Verlhac1, Niels van Mullekom1, Werner M.J. van Weerdenburg1, Hermann Osterhage1, Manuel Steinbrecher1, Katharina J. Franke2, and Alexander A. Khajetoorians1 — 1Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands — 2Fachbereich Physik, Freie Universität Berlin, Germany
Yu-Shiba-Rusinov (YSR) states arise from the exchange coupling between a local spin and a superconductor. However, characterizing this exchange interaction, related to Kondo screening, requires a study in magnetic field to understand its interplay with other energy scales, as well as the role of higher spin degrees of freedom. To date, most studies of YSR states have been limited to bulk superconductors, which easily quench in the presence of modest magnetic fields. Here, using high resolution milliKelvin scanning tunneling microscopy and spectroscopy, we characterize the magnetic phase diagram of a molecule on the surface of a thin film superconductor. We observe non-trivial changes in the YSR excitations in applied magnetic field, that cannot be described by the prototypical spin 1/2 model. These variations occur while the superconducting gap remains robust. We relate the changes to the various properties of the molecule, including the role of multiple channels and magnetic anisotropy. We additionally propose a model to understand the various behaviors in the excitation. These results provide an in-depth and detailed approach to understand the role of high spin systems in the presence of Kondo and YSR states.